Re: WMA46 Hotpoint Drain pump
1/4″ isn’t very much to be left on the brushes, and they can wear unevenly so the other side may be worse. Take the motor off and check both brushes, you will probably find at least one is dull on the end due to the poor contact.
Replace but make sure they are bedded in with a comm stick as well. Part will probably either be this or this depending if you have the FHP or Bosch motor fitted.
It’s normal for the drain pump to continue running as this runs throughout the spin cycle.